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/* ****************************************************************************
 * bmp_16_or.c -- Display a 16x16 BMP, using ORs.
 * Copyright (C) 2011 Pierre "PierrotLL" Le Gall <legallpierre89@gmail.com>
 * Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of the 'casiowin/monochromelib' module,
 * in libcarrot, an experimental modular libc project.
 *
 * This file is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This file is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Lesser Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this file.  If not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************* */
#include <monochrome.h>

void ML_bmp_16_or(const unsigned short *bmp, int x, int y)
{
	unsigned long line;
	char i, shift, begin=0, end=16, *screen, *p=(char*)&line+1;
	if(!bmp || x<0 || x>112 || y<-15 || y>63) return;
	if(y < 0) begin = -y;
	if(y > 48) end = 64-y;
	shift = 8-(x&7);
	screen = ML_vram_adress()+(y+begin<<4)+(x>>3);
	for(i=begin ; i<end ; i++)
	{
		line = bmp[i]<<shift;
		screen[0] |= *p;
		screen[1] |= *(p+1);
		if(shift!=8) screen[2] |= *(p+2);
		screen += 16;
	}
}